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High precision coupling system (2015)

Foremny, E.; Schenck, C.; Kuhfuß, B.

Proceedings of the 4M/ICOMM2015 International Conference on Micromanufacturing, 31st March-2nd April, 2015, Milano (Italy), ISBN 978-981-09-4609-8, Tagungsband S. 205-208


The mass production of plastic parts containing micro structures in optical quality requires molds with corresponding surface quality. These micro structured molds can be produced by ultra precision cutting (UPC). To produce a high surface quality the ultra precision machines must be well balanced. It is not sufficient to balance the tools and spindle separately. They have to be balanced while assembled to ensure the required balance quality grade better than G0.4. The balancing process is time consuming. To decrease setup times and increase the quality of the spindle balancing a coupling system between the spindle and machine frame based on flexure joints is presented. The experimental setup provides two states: operational and setup. The operational state provides a high stiffness, whereas the setup state allows the spindle to vibrate along one degree of freedom, enhancing the vibrations created by the unbalance and thus enabling detection of smaller unbalances. The system is analyzed concerning its ability to restore the defined conditions in the operational state as well as its capability to enhance vibration in the setup state.